Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Improvement and Determination of the Degree of Deacetylation of Chitosan via Potentiometric Titration Method and Infrared Spectroscopy

Document Type : Research Article

Authors
Morteza Hasanzadeh Kafshgari 1
Mohammad Khorram 1
Mohsen Mansouri 2
Abdolreza Samimi 2
1 School of Chemical, Petroleum and Gas Engineering, Shiraz University, Shiraz I.R. IRAN
2 Department of Chemical and Engineering, University of Sistan and Baluchestan, P.O. Box 98164-161 Zahedan, I.R. IRAN
Abstract
The Degree of Deacetylation (DD) of chitosan plays a main role in its physical, chemical and biological properties. Hence, in this study, low-viscous, medium, and high (impure and improved) molecular weight chitosan were used to determine DD, using a simple and exact method, The DDs of chitosan were determined by the fourier transform infrared spectroscopy (Baseline-a and b ) and linear potentiometric titration. Thie concluded results were compared using Root-Mean-Square Deviation (sRMSD) whereby an agreement between the linear potentiometric titration and fourier transform infrared spectroscopy (Baseline-a) were shown. In presented method, for purifying impurities and improving DD of the high molecular chitosan, DD was noticeably increased from 60.1 to 92.7 %. The analysis of chitosan's DD represented the raise of DD in the presence of the increase of viscosity and molecular weight of chitosan.
Keywords
Chitosan
Degree of deacetylation
Potentiometric titration
Infrared spectroscopy

Subjects

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